Blocked by a Supreme Court decision from using GPS tracking devices without a warrant, federal investigators and other law enforcement agencies are turning to a new, more powerful and more threatening technology in their bid to spy more freely on those they suspect of drug crimes. That’s leading civil libertarians, electronic privacy advocates, and even some federal judges to raise the alarm about a new surveillance technology whose use has yet to be taken up definitively by the federal courts.

When a suspect makes a phone call, the StingRay tricks the cell into sending its signal back to the police, thus preventing the signal from traveling back to the suspect’s wireless carrier. But not only does StingRay track the targeted cell phone, it also extracts data off potentially thousands of other cell phone users in the area.

Although manufactured by a Germany and Britain-based firm, the StingRay devices are sold in the US by the Harris Corporation, an international telecommunications equipment company. It gets between $60,000 and $175,000 for each Stingray it sells to US law enforcement agencies.

[While the US courts are only beginning to grapple with StingRay, the high tech cat-and-mouse game between cops and criminals continues afoot. Foreign hackers reportedly sell an underground IMSI tracker to counter the Stingray to anyone who asks for $1000. And in December 2011, noted German security expert Karsten Nohl released “Catcher Catcher,” powerful software that monitors a network’s traffic to seek out the StingRay in use.]

Originally intended for terrorism investigations, the feds and local law enforcement agencies are now using the James Bond-type surveillance to track cell phones in drug war cases across the nation without a warrant. Federal officials say that is fine — responding to a Freedom of Information Act (FOIA) request filed by the Electronic Freedom Foundation (EFF) and the First Amendment Coalition, the Justice Department argued that no warrant was needed to use StingRay technology.

“If a device is not capturing the contents of a particular dialogue call, the device does not require a warrant, but only a court order under the Pen Register Statute showing the material obtained is relevant to an ongoing investigation,” the department wrote.

The FBI claims that it is adhering to lawful standards in using StingRay. “The bureau advises field officers to work closely with the US Attorney’s Office in their districts to comply with legal requirements,” FBI spokesman Chris Allen told the Washington Post last week, but the agency has refused to fully disclose whether or not its agents obtain probable cause warrants to track phones using the controversial device.

And the federal government’s response to the EFF’s FOIA about Stingray wasn’t exactly responsive. While the FOIA request generated over 20,000 records related to StingRay, the Justice Department released only a pair of court orders and a handful of heavily redacted documents that didn’t explain when and how the technology was used.

The LA Weekly reported in January that the StingRay “intended to fight terrorism was used in far more routine Los Angeles Police criminal investigations,” apparently without the courts’ knowledge that it probes the lives of non-suspects living in the same neighborhood with a suspect.

Critics say the technology wrongfully invades technology and that its uncontrolled use by law enforcement raised constitutional questions. “It is the biggest threat to cell phone privacy you don’t know about,” EFF said in a statement.

ACLU privacy researcher Christopher Soghoian told a Yale Law School Location Tracking and Biometrics Conference panel last month that “the government uses the device either when a target is routinely and quickly changing phones to thwart a wiretap or when police don’t have sufficient cause for a warrant.”

“The government is hiding information about new surveillance technology not only from the public, but even from the courts,” ACLU staff attorney Linda Lye wrote in a legal brief in the first pending federal StingRay case (see below). “By keeping courts in the dark about new technologies, the government is essentially seeking to write its own search warrants, and that’s not how the Constitution works.”

Lye further expressed concern over the StingRay’s ability to interfere with cell phone signals in violation of Federal Communication Act. “We haven’t seen documents suggesting the LAPD or any other agency have sought or obtained FCC authorization,” she wrote.

StingRay pricing chart (publicintelligence.net)

“If the government shows up in your neighborhood, essentially every phone is going to check in with the government,” said the ACLU’s Soghoian. “The government is sending signals through people’s walls and clothes and capturing information about innocent people. That’s not much different than using invasive technology to search every house on a block,” Soghoian said during interviews with reporters covering the StingRay story.

Advocates also raised alarms over another troubling issue: Using the StingRay allows investigators to bypass the routine process of obtaining fee-based location data from cell service providers like Sprint, AT&T, Verizon, T-Mobile and Comcast. Unlike buying location data fro service providers, using StingRay leaves no paper trail for defense attorneys.

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